Choosing the right time of day makes all the difference in the world to planned activities with your child.
As a counsellor, I would choose to work with children in a morning session as opposed to the afternoon as children are more retentive and certainly more receptive to what you have to say. Their listening skills are much more responsive. They are less reactive to issues and can process at a calmer level.
In a classroom setting, teachers are very aware that the more serious learning will be happening in the morning block and not the afternoon after children have eaten, played etc. A lot of emotion comes into the afternoon, especially if play, did not provide a successful outcome. Often activities provided in the afternoon in a classroom are shorter, require less focus and teachers set less expectation for their students.
If you are planning a special time with your child, such as a visit to the zoo, museum, special visit to a friend etc. I recommend planning for the morning block. In this way, the child will be more attentive and their listening skills much higher. It sounds simple but if you want a quality experience from the activity or simply want a better response from your child, try morning blocks where possible.